Optimization of Soda-Anthraquinone Pulping of Yunma No.1 Hemp Hurds and its ECF Bleaching

摘要：

In this study Yunma No.1 hemp hurds were evaluated as potential raw materials for pulping.For obtaining readily bleachable pulp with acceptable properties,the nearly optimum conditions were: an alkali dosage of 19％,an AQ charge of 0.25％,and raw material-to-liquor of 1:4.5,165 ℃,90 min.The resultant pulp had screened yield of 50.1％,kappa number of 16.0,viscosity of 1095 dm3/kg,and brightness of 40.3％.Subsequently,bleaching sequences with oxygen delignification(O),chlorine dioxide(D),and peroxide(P)were investigated,and the optimum conditions were: alkali charge of 2.0％,90℃,60 min for the O step; chlorine dioxide dosage of 0.7％,70℃,120 min for the D step; hydrogen peroxide charge of 0.7％,0.5％ NaOH,2.5％ Na2SiO3,0.5％ MgSO4,and 0.5％ EDTA,65 ℃,60 min for the P step.The resultant bleached pulp had kappa number of 3.8,viscosity of 1031 dm3/kg and brightness of 85.3％.It should be noted that the viscosity loss was only 5.8％ during the bleaching process,indicating that the hemp hurd cellulose is superior to many other lignocellulosic materials,in terms of resisting degradation.

关键词： Yunma No.1 hemp soda-anthraquinone pulping ECF bleaching

作者: GAO XIN ZHANG HENG CHEN KELI

作者单位: The Research Center of Pulp & Paper Engineering,Kunming University of Science and Technology,Kunming,China

会议类型: 国际会议

会议名称: 第二届国际造纸与环境学术会议(The Second International Papermaking & Environment Conference)

会议地点: 天津

会议语种:英文

页码: 379-382

在线出版日期: 2008-05-14（万方平台首次上网日期，不代表论文的发表时间）